A method for transmitting information relating to a communication network, implemented by a first server of a communication network, the method comprising the following steps: storing a data table matching identifiers of subnetworks of the communication network associated with respective qualities of service, with at least one network address of a user terminal, the network address comprising an IP address of the user terminal; receiving a request from a second server of a service provider, the request requesting information linked to said communication network; transmitting at least a part of the data table to the second server, the part comprising the matches between each subnetwork identifier and the at least one network address of a user terminal.